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US 6,618,136 B1Granted
Method and apparatus for visually inspecting transparent body and translucent body
AssigneeMinolta Co., Ltd.
InventorFutoshi Ishida
Life of this patent
Estimating the term…
Abstract
A system and method of visually inspecting a transparent body and a translucent body comprises applying light to a reverse surface of an object to be inspected by a transmission light source, and applying light, at a low angle, to at least one of an obverse surface and the reverse surface of the object to be inspected by a reflection light source. Concave defects and adherents of the object to be inspected are detected by use of transmitted light emitted from the transmission light source, and adherents of the object to be inspected are detected by use of reflected scattered light emitted from the reflection light source.
Claims20
A method of visually inspecting an object having a transparent body or a translucent body,
- wherein light is applied to a reverse surface of an object to be inspected by a transmission light source,
- wherein light is applied to, at a low angle, to at least one of an obverse surface and the reverse surface of the object to be inspected by a reflection light source,
- wherein detection of concave defects and adherents of the object to be inspected by use of transmitted light emitted from the transmission light source and transmitted by the object to be inspected and detection of adherents of the object to be inspected by use of reflected scattered light emitted from the reflection light source and irregularly reflected at the object to be inspected are performed by a detector disposed on an obverse surface side of the object to be inspected in a position substantially parallel to an optical path of the transmission light source and where light from the transmission light source is not directly incident, and
- wherein the detected results are compared to distinguish the concave defects and the adherents.
1 more element
An apparatus for visually inspecting an object having a transparent body or a translucent body, comprising:
- a transmission light source disposed on a reverse surface side of an object to be inspected and applying light to a reverse surface of the object to be inspected;
- a reflection light source disposed on at least one of an obverse surface side and the reverse surface side of the object to be inspected and applying light to the object to be inspected at a low angle;
- a detector disposed on the obverse surface side of the object to be inspected in a position substantially parallel to an optical path of the transmission light source and where the light from the transmission light source is not directly incident;
- and
- a controller for controlling said detector to detect concave defects and adherents of the object to be inspected by use of transmitted light emitted from the transmission light source and transmitted by the object to be inspected, for controlling said detector to detect adherents of the object to be inspected by use of reflected scattered light emitted from the reflection light source and irregularly reflected at the object to be inspected, and for distinguishing the concave defects and the adherents by comparing the detected results.
2 more elements
An apparatus for visually inspecting an object having a transparent body or a translucent body, comprising:
- a transmission light source disposed on a reverse surface side of an object to be inspected and applying light to a reverse surface of the object to be inspected;
- a reflection light source disposed on at least one of an obverse surface side and the reverse surface side of the object to be inspected and applying light to the object to be inspected at a low angle;
- and
- a detector disposed on the obverse surface side of the object to be inspected in a position substantially parallel to an optical path of the transmission light source and where the light from the transmission light source is not directly incident;
- and
- a controller for controlling said detector to detect concave defects and adherents of the object to be inspected by use of transmitted light emitted from the transmission light source and transmitted by the object to be inspected, for controlling said detector to detect adherents of the object to be inspected by use of reflected scattered light emitted from the reflection light source and irregularly reflected at the object to be inspected, and for distinguishing the concave defects and the adherents by comparing the detected results,
- wherein an angle of inclination of the detector from the optical path of the transmission light source is approximately 5±3 degrees,
- wherein an angle of incidence of the reflection light source on the object to be inspected is approximately 4±3 degrees, and
- wherein the transmission light source is a light source in which angles of light beams illuminating the object to be inspected are substantially the same.
6 more elements
A method for visually inspecting an object having a transparent body or a translucent body, comprising the steps of:
- (a) illuminating said object with a first light source applied to a reverse surface of said object;
- (b) detecting, under the illuminating condition of the step (a), a first image of said object with a detector;
- (c) storing said first image of said illuminated object into a memory;
- (d) illuminating said object with only a second light source applied to at least one of a obverse surface and the reverse surface of said object;
- (e) detecting, under the illuminating condition of the step (d), a second image of said illuminated object with a detector;
- (f) storing said second image of said illuminated object into a memory;
- (g) comparing said first stored image and second stored image to distinguish concave defects and adherents,
- wherein light from said second light source is applied at a low angle to illuminate said transparent body.
5 more elements
A method of visually inspecting both of a front surface and a rear surface of an object that has a transparent body or a translucent body,
- wherein light is illuminated, at a first angle, to the rear surface of the object by a transmission light source,
- wherein lights are separately illuminated, at a second angle lower than the first angle, to the front surface and the rear surface of the object by at least one reflection light source, and
- wherein detection of concave defects and adherents of the object by use of transmitted light emitted from the transmission light source and transmitted by the object and detection of adherents of the object by use of scattered lights separately emitted from the at least one reflection light source and irregularly reflected on the front surface and the rear surface are performed by a detector.
Dependencies are inferred from the claim text.